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<?php function parse_yturl($url) { $pattern = '#^(?:https?://)?(?:www\.)?(?:youtu\.be/|youtube\.com(?:/embed/|/v/|/watch\?v=|/watch\?.+&v=))([\w-]{11})(?:.+)?$#x'; preg_match($pattern, $url, $matches); return (isset($matches[1])) ? $matches[1] : false; } var_dump(parse_yturl("https://www.youtube.com/watch?v=21rAgXT-jYg"));
Output for git.master, git.master_jit, rfc.property-hooks
string(11) "21rAgXT-jYg"

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